From: Mauro Carvalho Chehab <mchehab@kernel•org>
To: Paul Kocialkowski <paul.kocialkowski@bootlin•com>
Cc: Nicolas Dufresne <nicolas@ndufresne•ca>,
Jernej Skrabec <jernej.skrabec@siol•net>,
Jonas Karlman <jonas@kwiboo•se>, Chen-Yu Tsai <wens@csie•org>,
Maxime Ripard <mripard@bootlin•com>,
linux-kernel@vger•kernel.org, Hans Verkuil <hverkuil@xs4all•nl>,
linux-sunxi@googlegroups•com,
Thomas Petazzoni <thomas.petazzoni@bootlin•com>,
Tomasz Figa <tfiga@chromium•org>,
Ezequiel Garcia <ezequiel@collabora•com>,
linux-arm-kernel@lists•infradead.org,
linux-media@vger•kernel.org
Subject: Re: [PATCH v8 3/3] media: cedrus: Add HEVC/H.265 decoding support
Date: Thu, 17 Oct 2019 09:57:51 -0300 [thread overview]
Message-ID: <20191017095751.5a229051@coco.lan> (raw)
In-Reply-To: <20190927143411.141526-4-paul.kocialkowski@bootlin.com>
Em Fri, 27 Sep 2019 16:34:11 +0200
Paul Kocialkowski <paul.kocialkowski@bootlin•com> escreveu:
> This introduces support for HEVC/H.265 to the Cedrus VPU driver, with
> both uni-directional and bi-directional prediction modes supported.
>
> Field-coded (interlaced) pictures, custom quantization matrices and
> 10-bit output are not supported at this point.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin•com>
> ---
...
> + unsigned int ctb_size_luma =
> + 1 << log2_max_luma_coding_block_size;
Shifts like this is a little scary. "1" constant is signed. So, if
log2_max_luma_coding_block_size is 31, the above logic has undefined
behavior. Different archs and C compilers may handle it on different
ways.
> +#define VE_DEC_H265_LOW_ADDR_PRIMARY_CHROMA(a) \
> + (((a) << 24) & GENMASK(31, 24))
Same applies here and on other similar macros. You need to enforce
(a) to be unsigned, as otherwise the behavior is undefined.
Btw, this is a recurrent pattern on this file. I would define a
macro, e. g. something like:
#define MASK_BITS_AND_SHIFT(v, high, low) \
((UL(v) << low) & GENMASK(high, low))
And use it for all similar patterns here.
The best would be to include such macro at linux/bits.h, although some
upstream discussion is required.
So, for now, let's add it at this header file, but work upstream
to have it merged there.
Thanks,
Mauro
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next prev parent reply other threads:[~2019-10-17 12:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 14:34 [PATCH v8 0/3] HEVC/H.265 stateless support for V4L2 and Cedrus Paul Kocialkowski
2019-09-27 14:34 ` [PATCH v8 1/3] media: v4l: Add definitions for HEVC stateless decoding Paul Kocialkowski
2019-09-27 14:34 ` [PATCH v8 2/3] media: pixfmt: Document the HEVC slice pixel format Paul Kocialkowski
2019-09-27 14:34 ` [PATCH v8 3/3] media: cedrus: Add HEVC/H.265 decoding support Paul Kocialkowski
2019-10-17 12:57 ` Mauro Carvalho Chehab [this message]
2019-10-22 12:40 ` Paul Kocialkowski
2019-10-22 13:17 ` Paul Kocialkowski
2019-10-22 13:37 ` Hans Verkuil
2019-10-22 14:01 ` Paul Kocialkowski
2019-10-22 14:02 ` Hans Verkuil
2019-10-08 21:48 ` [PATCH v8 0/3] HEVC/H.265 stateless support for V4L2 and Cedrus Jernej Škrabec
2019-10-09 7:12 ` Paul Kocialkowski
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